how can i see all layers when i render animation?
If I'm not misunderstanding, I believe you want the Render Layers feature. It's in the second tab of the Properties editor 

you can choose which layers are visible in the final render using the boxes on the left-hand side:


Without sphere's layer selected

With sphere's layer selected as well

that's the simplest use for it at least, there's a lot of useful things other than that as well